/* Premium Glassmorphism Theme */
:root {
  /* Deep Space Palette - Dark Mode (Default) */
  --bg-gradient-start: #0f172a;
  --bg-gradient-end: #1e1b4b;
  --bg-solid: #0f172a;
  --primary-accent: #22d3ee;
  --primary-accent-hover: #06b6d4;
  --secondary-accent: #a855f7;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-on-accent: #ffffff;

  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.03);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.36);
  --backdrop-blur: 12px;

  /* Code blocks */
  --code-bg: rgba(0, 0, 0, 0.3);
  --code-text: #22d3ee;
  --pre-bg: rgba(0, 0, 0, 0.5);

  /* Spacing */
  --header-height: 80px;
  --card-padding: 2.5rem;
}

/* Light Mode */
[data-theme="light"] {
  --bg-gradient-start: #f8fafc;
  --bg-gradient-end: #e2e8f0;
  --bg-solid: #ffffff;
  --primary-accent: #0891b2;
  --primary-accent-hover: #0e7490;
  --secondary-accent: #7c3aed;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-on-accent: #ffffff;

  /* Glassmorphism - Light */
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(0, 0, 0, 0.08);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.1);

  /* Code blocks - Light */
  --code-bg: rgba(0, 0, 0, 0.05);
  --code-text: #0891b2;
  --pre-bg: #1e293b;
}

/* ==================== SITE HEADER BAR ==================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 50px;
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  z-index: 10000;
}

.site-header-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.site-header-logo {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  object-fit: contain;
}

.site-header-info {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.site-header-company {
  font-family: 'Outfit', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.2;
}

.site-header-position {
  font-size: 0.7rem;
  color: var(--primary-accent);
  font-weight: 500;
  letter-spacing: 0.02em;
}

.site-header-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.75rem;
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.15), rgba(168, 85, 247, 0.15));
  border: 1px solid rgba(34, 211, 238, 0.3);
  border-radius: 20px;
  font-size: 0.7rem;
  color: var(--primary-accent);
  font-weight: 500;
}

.site-header-badge svg {
  width: 14px;
  height: 14px;
}

/* Adjust body padding for fixed header */
body {
  padding-top: 50px;
}

/* Light mode site header */
[data-theme="light"] .site-header {
  background: rgba(255, 255, 255, 0.95);
}

[data-theme="light"] .site-header-company {
  color: var(--text-primary);
}

/* Mobile responsive site header */
@media (max-width: 600px) {
  .site-header {
    padding: 0 1rem;
  }

  .site-header-badge {
    display: none;
  }

  .site-header-company {
    font-size: 0.75rem;
  }

  .site-header-position {
    font-size: 0.65rem;
  }

  .site-header-logo {
    width: 28px;
    height: 28px;
  }
}

/* ==================== THEME TOGGLE ==================== */
.theme-toggle {
  position: fixed;
  top: 58px;
  right: 1rem;
  z-index: 9999;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.theme-toggle:hover {
  background: rgba(34, 211, 238, 0.1);
  border-color: var(--primary-accent);
}

.theme-toggle-track {
  position: relative;
  width: 48px;
  height: 26px;
  background: var(--glass-border);
  border-radius: 50px;
  transition: all 0.3s ease;
}

.theme-toggle-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 20px;
  height: 20px;
  background: var(--text-primary);
  border-radius: 50%;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle-thumb svg {
  width: 12px;
  height: 12px;
  color: var(--bg-solid);
}

[data-theme="light"] .theme-toggle-thumb {
  left: 25px;
}

.theme-toggle-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
  background-attachment: fixed;
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

h1 {
  font-size: 2.5rem;
  background: linear-gradient(to right, var(--primary-accent), var(--secondary-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
}

h2 {
  font-size: 1.75rem;
  margin-top: 2rem;
  border-bottom: 1px solid var(--glass-border);
  padding-bottom: 0.75rem;
  display: inline-block;
}

h3 {
  font-size: 1.25rem;
  color: var(--primary-accent);
  margin-top: 2rem;
}

p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  font-size: 1.05rem;
}

code {
  font-family: 'JetBrains Mono', monospace;
  background: var(--code-bg);
  padding: 0.2em 0.4em;
  border-radius: 4px;
  color: var(--code-text);
  font-size: 0.9em;
}

pre {
  background: var(--pre-bg);
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid var(--glass-border);
  overflow-x: auto;
  margin: 1.5rem 0;
}

pre code {
  background: transparent;
  color: #a0ffa0;
}

/* High Contrast Code Blocks (User Request) */
pre {
  background: #000000 !important; /* Pure black background */
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.5);
}

pre code {
  color: #ffffff !important; /* Pure white text */
  text-shadow: none;
  font-weight: 500;
}

/* Vibrant Syntax Highlighting */
pre code .keyword { color: #ff79c6 !important; font-weight: bold; } /* Pink */
pre code .string { color: #f1fa8c !important; } /* Yellow */
pre code .comment { color: #6272a4 !important; font-style: italic; } /* Gray-Blue */
pre code .function { color: #8be9fd !important; } /* Cyan */
pre code .number { color: #bd93f9 !important; } /* Purple */
pre code .operator { color: #ff79c6 !important; } /* Pink */
pre code .class-name { color: #50fa7b !important; } /* Green */
pre code .boolean { color: #bd93f9 !important; } /* Purple */

/* Light mode code blocks */
[data-theme="light"] pre {
  background: #1e293b;
  border-color: rgba(30, 41, 59, 0.3);
}

[data-theme="light"] pre code {
  color: #e2e8f0;
}

/* ==================== MODULE PAGE RESPONSIVE LAYOUT ==================== */
/* Base styles for module content - ensure content doesn't overflow */
main.module-content {
  width: 100%;
  box-sizing: border-box;
}

main.module-content section.card {
  min-width: 0; /* Allow cards to shrink below content size */
  overflow: hidden; /* Prevent content overflow */
  box-sizing: border-box;
  width: 100%;
}

/* Ensure all child elements respect container width */
main.module-content section.card > * {
  max-width: 100%;
  box-sizing: border-box;
}

/* Code blocks responsive */
main.module-content pre {
  max-width: 100%;
  overflow-x: auto;
}

/* 2-column layout for larger screens */
@media (min-width: 1100px) {
  main.module-content {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    align-items: start;
  }

  main.module-content section.card {
    margin-bottom: 0;
  }

  main.module-content .faq-section {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1400px) {
  main.module-content {
    gap: 2rem;
  }
}

/* Medium screens - single column with proper width */
@media (max-width: 1099px) {
  main.module-content {
    display: block;
  }

  main.module-content section.card {
    margin-bottom: 1.5rem;
    width: 100%;
  }
}

/* Small screens - reduce padding */
@media (max-width: 768px) {
  main.module-content {
    padding: 0;
  }

  main.module-content section.card {
    border-radius: 12px;
  }
}

/* ==================== VIDEO THUMBNAIL LINKS ==================== */
.video-thumbnail-link {
  display: block;
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  background: rgba(0, 0, 0, 0.3);
  transition: all 0.3s ease;
}

.video-thumbnail-link:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

.video-thumbnail-link img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  border-radius: 8px;
  border: none;
  box-shadow: none;
  transition: transform 0.3s ease;
}

.video-thumbnail-link:hover img {
  transform: scale(1.03);
}

.video-play-overlay {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  background: rgba(255, 0, 0, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.video-play-overlay svg {
  width: 24px;
  height: 24px;
  fill: white;
  margin-left: 3px;
}

.video-thumbnail-link:hover .video-play-overlay {
  background: #ff0000;
  transform: translate(-50%, -50%) scale(1.1);
}

.video-title {
  margin-top: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-align: center;
  line-height: 1.4;
}

/* ==================== FAQ SECTION ==================== */
.faq-section {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--backdrop-blur));
  -webkit-backdrop-filter: blur(var(--backdrop-blur));
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: var(--card-padding);
  margin-bottom: 2.5rem;
}

.faq-section h2 {
  margin-top: 0;
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
  background: linear-gradient(135deg, var(--primary-accent), var(--secondary-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  border-bottom: none;
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
}

.faq-item {
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-item:hover {
  border-color: rgba(34, 211, 238, 0.3);
}

.faq-question {
  width: 100%;
  padding: 1rem 1.25rem;
  background: rgba(34, 211, 238, 0.05);
  border: none;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 600;
  text-align: left;
  cursor: default;
  display: block;
}

.faq-question:hover {
  background: rgba(34, 211, 238, 0.05);
  transform: none;
  box-shadow: none;
}

.faq-question svg {
  display: none;
}

.faq-answer {
  display: block;
  padding: 1rem 1.25rem;
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.7;
  border-top: 1px solid var(--glass-border);
}

.faq-answer code {
  background: rgba(34, 211, 238, 0.1);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.8rem;
}

[data-theme="light"] .faq-item {
  background: rgba(0, 0, 0, 0.02);
}

[data-theme="light"] .faq-question {
  background: rgba(8, 145, 178, 0.05);
}

[data-theme="light"] .faq-question:hover {
  background: rgba(8, 145, 178, 0.1);
}

/* ==================== GLOSSARY SECTION ==================== */
.glossary-section {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--backdrop-blur));
  -webkit-backdrop-filter: blur(var(--backdrop-blur));
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: var(--card-padding);
  margin-bottom: 2.5rem;
}

.glossary-section h2 {
  margin-top: 0;
  margin-bottom: 1rem;
  font-size: 1.5rem;
  background: linear-gradient(135deg, var(--primary-accent), var(--secondary-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.glossary-intro {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.glossary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1rem;
}

.glossary-item {
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 1.25rem;
  transition: all 0.3s ease;
}

.glossary-item:hover {
  border-color: rgba(34, 211, 238, 0.4);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.glossary-item h4 {
  margin: 0 0 0.75rem 0;
  font-size: 1rem;
  color: var(--primary-accent);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.glossary-item .zh-term {
  font-size: 0.85rem;
  color: var(--secondary-accent);
  font-weight: 500;
}

.glossary-item .en-def {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0 0 0.75rem 0;
  padding-bottom: 0.75rem;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.1);
}

.glossary-item .zh-def {
  font-size: 0.85rem;
  color: #e0f7fa;
  line-height: 1.7;
  margin: 0;
}

/* Light theme glossary */
[data-theme="light"] .glossary-item {
  background: rgba(0, 0, 0, 0.02);
}

[data-theme="light"] .glossary-item:hover {
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .glossary-item .zh-def {
  color: var(--text-primary);
}

[data-theme="light"] .glossary-item .en-def {
  border-bottom-color: rgba(0, 0, 0, 0.1);
}

/* Responsive glossary for module-content grid */
main.module-content .glossary-section {
  grid-column: 1 / -1;
}

/* ==================== HERO SECTION ==================== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 2rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(34, 211, 238, 0.15), transparent),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(168, 85, 247, 0.1), transparent),
    radial-gradient(ellipse 60% 40% at 20% 80%, rgba(34, 211, 238, 0.08), transparent);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
}

.hero-badge {
  display: inline-block;
  padding: 0.5rem 1.5rem;
  background: rgba(34, 211, 238, 0.1);
  border: 1px solid rgba(34, 211, 238, 0.3);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--primary-accent);
  margin-bottom: 1.5rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  line-height: 1.1;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary-accent) 50%, var(--secondary-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.1rem;
  max-width: 700px;
  margin: 0 auto 2rem;
}

.hero-subtitle .zh {
  display: block;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.hero-subtitle .en {
  display: block;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.btn-primary,
.btn-secondary {
  padding: 1rem 2.5rem;
  border-radius: 50px;
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-accent), var(--secondary-accent));
  color: white;
  box-shadow: 0 4px 20px rgba(34, 211, 238, 0.3);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(34, 211, 238, 0.4);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--primary-accent);
  color: var(--primary-accent);
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 3rem;
  flex-wrap: wrap;
}

.stat {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 2.5rem;
  font-weight: 700;
  font-family: 'Outfit', sans-serif;
  background: linear-gradient(135deg, var(--primary-accent), var(--secondary-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  opacity: 0.7;
  transition: opacity 0.3s;
}

.scroll-indicator:hover {
  opacity: 1;
}

.scroll-indicator span {
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.scroll-arrow {
  width: 24px;
  height: 24px;
  border-right: 2px solid var(--primary-accent);
  border-bottom: 2px solid var(--primary-accent);
  transform: rotate(45deg);
  animation: scrollBounce 2s infinite;
}

@keyframes scrollBounce {
  0%, 20%, 50%, 80%, 100% {
    transform: rotate(45deg) translateY(0);
  }
  40% {
    transform: rotate(45deg) translateY(10px);
  }
  60% {
    transform: rotate(45deg) translateY(5px);
  }
}

/* ==================== COMPANY OVERVIEW SECTION ==================== */
.company-overview {
  padding: 3rem 2rem;
  margin: 0 auto;
  max-width: 900px;
  text-align: center;
}

.company-content h2 {
  font-size: 1.75rem;
  margin-bottom: 1.5rem;
  border-bottom: none;
  background: linear-gradient(135deg, var(--text-primary), var(--primary-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.company-content p {
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 1rem;
}

.company-content p.zh {
  color: var(--text-primary);
}

.company-content p.en {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.company-content strong {
  color: var(--primary-accent);
  font-weight: 600;
}

.tech-stack-preview {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 2rem;
}

.tech-tag {
  padding: 0.5rem 1rem;
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.1), rgba(168, 85, 247, 0.1));
  border: 1px solid rgba(34, 211, 238, 0.2);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--primary-accent);
  font-weight: 500;
  transition: all 0.3s ease;
}

.tech-tag:hover {
  transform: translateY(-2px);
  border-color: var(--primary-accent);
  box-shadow: 0 5px 15px rgba(34, 211, 238, 0.2);
}

[data-theme="light"] .tech-tag {
  background: linear-gradient(135deg, rgba(8, 145, 178, 0.1), rgba(124, 58, 237, 0.1));
  border-color: rgba(8, 145, 178, 0.2);
  color: var(--primary-accent);
}

/* ==================== MODULES CONTAINER (INDEX PAGE) ==================== */
#modules {
  width: 100%;
  padding-bottom: 100px; /* Space for fixed bottom nav */
}

/* ==================== SECTION HEADER ==================== */
.section-header {
  text-align: center;
  padding: 4rem 2rem 2rem;
  background: none;
  border: none;
  box-shadow: none;
}

.section-header:hover {
  transform: none;
  box-shadow: none;
  border-color: transparent;
}

.section-header h2 {
  font-size: 2rem;
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--text-primary), var(--primary-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-header p {
  color: var(--text-secondary);
  max-width: 800px;
  margin: 0 auto;
}

/* ==================== MODULES GRID ==================== */
.modules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  padding: 0 2rem 4rem;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
}

.module-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--backdrop-blur));
  -webkit-backdrop-filter: blur(var(--backdrop-blur));
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 2rem;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.module-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-accent), var(--secondary-accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.module-card:hover {
  transform: translateY(-8px);
  border-color: rgba(34, 211, 238, 0.3);
  box-shadow:
    0 20px 40px rgba(0, 0, 0, 0.3),
    0 0 60px rgba(34, 211, 238, 0.1);
}

.module-card:hover::before {
  transform: scaleX(1);
}

.module-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.2), rgba(168, 85, 247, 0.2));
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.module-icon svg {
  width: 28px;
  height: 28px;
  color: var(--primary-accent);
}

.module-number {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--secondary-accent);
  margin-bottom: 0.5rem;
}

.module-card h3 {
  font-size: 1.3rem;
  color: var(--text-primary);
  margin: 0 0 1rem;
  line-height: 1.3;
}

.module-card p {
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 0.5rem;
  flex-grow: 1;
}

.module-card p.zh {
  color: var(--text-secondary);
}

.module-card p.en {
  color: rgba(148, 163, 184, 0.7);
  font-size: 0.85rem;
}

.module-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.tag {
  padding: 0.3rem 0.8rem;
  background: rgba(34, 211, 238, 0.1);
  border: 1px solid rgba(34, 211, 238, 0.2);
  border-radius: 50px;
  font-size: 0.75rem;
  color: var(--primary-accent);
}

.module-arrow {
  position: absolute;
  bottom: 1.5rem;
  right: 1.5rem;
  width: 36px;
  height: 36px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateX(-10px);
  transition: all 0.3s ease;
}

.module-arrow svg {
  width: 18px;
  height: 18px;
  color: var(--primary-accent);
}

.module-card:hover .module-arrow {
  opacity: 1;
  transform: translateX(0);
}

.practice-card {
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.1), rgba(34, 211, 238, 0.1));
  border-color: rgba(168, 85, 247, 0.2);
}

.practice-card:hover {
  border-color: rgba(168, 85, 247, 0.4);
}

.projects-card {
  background: linear-gradient(135deg, rgba(34, 197, 94, 0.1), rgba(16, 185, 129, 0.1));
  border-color: rgba(34, 197, 94, 0.2);
}

.projects-card:hover {
  border-color: rgba(34, 197, 94, 0.4);
  box-shadow:
    0 20px 40px rgba(0, 0, 0, 0.3),
    0 0 60px rgba(34, 197, 94, 0.1);
}

/* ==================== YOUTUBE / LEARNING RESOURCES ==================== */
.resources-section {
  padding: 4rem 3rem;
  width: 100%;
  box-sizing: border-box;
  background: none;
  border: none;
  box-shadow: none;
}

.resources-section:hover {
  transform: none;
  box-shadow: none;
  border-color: transparent;
}

.resources-section h2 {
  text-align: center;
  font-size: 2rem;
  border-bottom: none;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, var(--text-primary), var(--primary-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.resources-section > p {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.youtube-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  width: 100%;
  max-width: 100%;
}

.youtube-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  overflow: hidden;
  transition: all 0.3s ease;
}

.youtube-card:hover {
  transform: translateY(-5px);
  border-color: rgba(255, 0, 0, 0.3);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
}

.youtube-thumbnail {
  display: block;
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
}

.youtube-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
  border-radius: 0;
  border: none;
  box-shadow: none;
}

.youtube-card:hover .youtube-thumbnail img {
  transform: scale(1.05);
}

.play-button {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  background: rgba(255, 0, 0, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.play-button svg {
  width: 24px;
  height: 24px;
  color: white;
  margin-left: 3px;
}

.youtube-card:hover .play-button {
  background: #ff0000;
  transform: translate(-50%, -50%) scale(1.1);
}

.youtube-info {
  padding: 1.25rem;
}

.youtube-info h4 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  color: var(--text-primary);
}

.youtube-info p {
  margin: 0 0 0.25rem;
  font-size: 0.85rem;
}

.youtube-info p.zh {
  color: var(--text-secondary);
}

.youtube-info p.en {
  color: rgba(148, 163, 184, 0.7);
  font-size: 0.8rem;
}

.youtube-tag {
  display: inline-block;
  margin-top: 0.75rem;
  padding: 0.25rem 0.75rem;
  background: rgba(255, 0, 0, 0.1);
  border: 1px solid rgba(255, 0, 0, 0.2);
  border-radius: 50px;
  font-size: 0.7rem;
  color: #ff6b6b;
}

/* ==================== QUICK NAVIGATION (BOTTOM BAR) ==================== */
.quick-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem 2rem;
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--glass-border);
  z-index: 1000;
}

.quick-nav-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0.75rem 1.5rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  text-decoration: none;
  transition: all 0.3s ease;
  min-width: 100px;
}

.quick-nav-btn:hover {
  background: rgba(34, 211, 238, 0.1);
  border-color: var(--primary-accent);
  transform: translateY(-3px);
}

.quick-nav-btn .nav-label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

.quick-nav-btn .nav-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
}

.quick-nav-btn.practice {
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.2), rgba(34, 211, 238, 0.2));
  border-color: rgba(168, 85, 247, 0.3);
}

.quick-nav-btn.practice:hover {
  border-color: var(--secondary-accent);
}

.quick-nav-btn.projects {
  background: linear-gradient(135deg, rgba(34, 197, 94, 0.2), rgba(16, 185, 129, 0.2));
  border-color: rgba(34, 197, 94, 0.3);
}

.quick-nav-btn.projects:hover {
  border-color: #22c55e;
}

/* ==================== SIDE NAVIGATION (MODULE PAGES) ==================== */
.side-nav {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  z-index: 100;
}

.side-nav.prev {
  left: 1rem;
}

.side-nav.next {
  right: 1rem;
}

.side-nav-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 80px;
  background: rgba(15, 23, 42, 0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  text-decoration: none;
  transition: all 0.3s ease;
  color: var(--text-secondary);
}

.side-nav-btn:hover {
  background: rgba(34, 211, 238, 0.15);
  border-color: var(--primary-accent);
  color: var(--primary-accent);
  transform: scale(1.05);
}

.side-nav-btn svg {
  width: 28px;
  height: 28px;
  margin-bottom: 0.25rem;
}

.side-nav-btn span {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ==================== MODULE PAGE NAVIGATION BAR ==================== */
.module-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background: rgba(15, 23, 42, 0.7);
  backdrop-filter: blur(var(--backdrop-blur));
  -webkit-backdrop-filter: blur(var(--backdrop-blur));
  border-bottom: 1px solid var(--glass-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.module-nav-links {
  display: flex;
  gap: 1rem;
}

.module-nav a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.3s ease;
}

.module-nav a:hover {
  background: rgba(34, 211, 238, 0.1);
  border-color: var(--primary-accent);
  color: var(--primary-accent);
}

.module-nav a svg {
  width: 18px;
  height: 18px;
}

.module-nav .nav-next {
  background: linear-gradient(135deg, var(--primary-accent), var(--secondary-accent));
  border: none;
  color: white;
}

.module-nav .nav-next:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 20px rgba(34, 211, 238, 0.3);
}

/* ==================== BOTTOM MODULE NAVIGATION ==================== */
.module-bottom-nav {
  display: flex;
  justify-content: space-between;
  align-items: stretch;
  gap: 1.5rem;
  padding: 2rem;
  margin-top: 2rem;
  max-width: 1400px;
  margin-left: auto;
  margin-right: auto;
}

.bottom-nav-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 1.5rem 2rem;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  text-decoration: none;
  transition: all 0.3s ease;
}

.bottom-nav-btn:hover {
  transform: translateY(-5px);
  border-color: var(--primary-accent);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
}

.bottom-nav-btn.prev {
  align-items: flex-start;
}

.bottom-nav-btn.next {
  align-items: flex-end;
  text-align: right;
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.1), rgba(168, 85, 247, 0.1));
}

.bottom-nav-btn .nav-direction {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.bottom-nav-btn .nav-direction svg {
  width: 16px;
  height: 16px;
}

.bottom-nav-btn .nav-module-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.bottom-nav-btn.next .nav-direction {
  color: var(--primary-accent);
}

/* ==================== ORIGINAL STYLES (LAYOUT) ==================== */
header {
  height: var(--header-height);
  background: rgba(15, 23, 42, 0.7);
  backdrop-filter: blur(var(--backdrop-blur));
  -webkit-backdrop-filter: blur(var(--backdrop-blur));
  border-bottom: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 5%;
  position: sticky;
  top: 0;
  z-index: 1000;
}

header h1 {
  font-size: 1.5rem;
  margin: 0;
  -webkit-text-fill-color: initial;
  background: none;
  color: var(--text-primary);
}

nav {
  display: flex;
  gap: 2rem;
}

nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: all 0.3s ease;
  position: relative;
}

nav a:hover {
  color: var(--primary-accent);
}

nav a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -4px;
  left: 0;
  background-color: var(--primary-accent);
  transition: width 0.3s ease;
}

nav a:hover::after {
  width: 100%;
}

main {
  max-width: 1600px;
  margin: 3rem auto;
  padding: 0 3rem;
  padding-bottom: 100px; /* Space for fixed bottom nav */
  box-sizing: border-box;
  width: 100%;
}

/* Responsive main padding */
@media (max-width: 1099px) {
  main {
    padding: 0 2rem;
    padding-bottom: 100px;
    margin: 2rem auto;
  }
}

@media (max-width: 768px) {
  main {
    padding: 0 1rem;
    padding-bottom: 100px;
    margin: 1rem auto;
  }
}

/* Glass Cards */
section,
.card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--backdrop-blur));
  -webkit-backdrop-filter: blur(var(--backdrop-blur));
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: var(--card-padding);
  margin-bottom: 2.5rem;
  box-shadow: var(--glass-shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

section:hover,
.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.45);
  border-color: rgba(255, 255, 255, 0.15);
}

/* Interactive Elements */
button {
  background: linear-gradient(135deg, var(--primary-accent), var(--secondary-accent));
  color: white;
  border: none;
  padding: 0.8rem 2rem;
  border-radius: 50px;
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(34, 211, 238, 0.3);
  text-transform: uppercase;
  letter-spacing: 1px;
}

button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(168, 85, 247, 0.4);
  filter: brightness(1.1);
}

button:active {
  transform: translateY(0);
}

input,
textarea {
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  padding: 1rem;
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  width: 100%;
  box-sizing: border-box;
  transition: all 0.3s ease;
}

input:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary-accent);
  background: rgba(0, 0, 0, 0.4);
  box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.1);
}

/* Feedback Area */
.feedback-area {
  margin-top: 1.5rem;
  padding: 1.5rem;
  background: rgba(34, 211, 238, 0.05);
  border-left: 3px solid var(--primary-accent);
  border-radius: 0 8px 8px 0;
  color: var(--text-primary);
  font-size: 0.95rem;
}

/* Details/Summary */
details {
  background: rgba(0, 0, 0, 0.2);
  border-radius: 8px;
  overflow: hidden;
  margin: 1.5rem 0;
}

summary {
  padding: 1rem 1.5rem;
  cursor: pointer;
  font-weight: 600;
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.02);
  transition: background 0.2s;
}

summary:hover {
  background: rgba(255, 255, 255, 0.05);
}

details[open] summary {
  border-bottom: 1px solid var(--glass-border);
}

details>*:not(summary) {
  padding: 1.5rem;
}

/* Bilingual Block */
.bilingual-block {
  display: grid;
  gap: 1.5rem;
}

.zh {
  color: var(--text-primary);
  font-size: 1.1rem;
  line-height: 1.8;
}

.en {
  color: var(--text-secondary);
  font-style: italic;
  border-left: 2px solid var(--glass-border);
  padding-left: 1rem;
}

/* Images */
img {
  border-radius: 12px;
  border: 1px solid var(--glass-border);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

section {
  animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem;
  border-top: 1px solid var(--glass-border);
  margin-top: 4rem;
  padding-bottom: 120px; /* Space for fixed nav */
}

footer p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2rem;
  }

  .hero-stats {
    gap: 1.5rem;
  }

  .stat-number {
    font-size: 2rem;
  }

  .modules-grid {
    grid-template-columns: 1fr;
    padding: 0 1rem 4rem;
  }

  .youtube-grid {
    grid-template-columns: 1fr;
  }

  .quick-nav {
    padding: 0.75rem 0.5rem;
    gap: 0.25rem;
    overflow-x: auto;
    justify-content: flex-start;
  }

  .quick-nav-btn {
    min-width: 70px;
    padding: 0.5rem 0.75rem;
  }

  .quick-nav-btn .nav-title {
    font-size: 0.75rem;
  }

  .side-nav {
    display: none;
  }

  .module-bottom-nav {
    flex-direction: column;
  }

  .bottom-nav-btn.next {
    align-items: flex-start;
    text-align: left;
  }

  .module-nav {
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
  }

  .module-nav a {
    padding: 0.6rem 1rem;
    font-size: 0.85rem;
  }
}

@media (max-width: 480px) {
  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
    justify-content: center;
  }
}

/* ==================== WIDE SCREEN OPTIMIZATIONS ==================== */
/* Medium monitors (900px+) - 2 columns */
@media (min-width: 900px) {
  .modules-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    padding: 0 2rem 4rem;
  }

  .youtube-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
}

/* Large monitors (1200px+) - 3 columns */
@media (min-width: 1200px) {
  .modules-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    padding: 0 3rem 4rem;
  }

  .youtube-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }
}

/* Extra large monitors (1600px+) - 3 columns with more space */
@media (min-width: 1600px) {
  .modules-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    padding: 0 4rem 4rem;
  }

  .youtube-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }

  .resources-section {
    padding: 4rem;
  }

  main {
    padding: 0 4rem;
    padding-bottom: 100px;
  }

  .section-header {
    padding: 4rem 4rem 2rem;
  }
}

/* Ultra-wide monitors (2000px+) - 4 columns */
@media (min-width: 2000px) {
  .modules-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    padding: 0 5rem 4rem;
  }

  .youtube-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
  }

  .resources-section {
    padding: 4rem 5rem;
  }

  main {
    max-width: none;
    padding: 0 5rem;
  }

  .hero-content {
    max-width: 1200px;
  }

  .section-header {
    padding: 5rem 5rem 2rem;
  }
}

/* ==================== LIGHT MODE OVERRIDES ==================== */
[data-theme="light"] body {
  background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
}

[data-theme="light"] .hero::before {
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(8, 145, 178, 0.1), transparent),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(124, 58, 237, 0.08), transparent),
    radial-gradient(ellipse 60% 40% at 20% 80%, rgba(8, 145, 178, 0.06), transparent);
}

[data-theme="light"] .hero-title {
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary-accent) 50%, var(--secondary-accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
}

[data-theme="light"] .hero-badge {
  background: rgba(8, 145, 178, 0.1);
  border-color: rgba(8, 145, 178, 0.3);
  color: var(--primary-accent);
}

[data-theme="light"] .btn-primary {
  background: linear-gradient(135deg, var(--primary-accent), var(--secondary-accent));
  color: var(--text-on-accent);
}

[data-theme="light"] .btn-secondary {
  background: rgba(0, 0, 0, 0.03);
  border-color: rgba(0, 0, 0, 0.15);
  color: var(--text-primary);
}

[data-theme="light"] .btn-secondary:hover {
  background: rgba(0, 0, 0, 0.05);
  border-color: var(--primary-accent);
  color: var(--primary-accent);
}

[data-theme="light"] .stat-number {
  background: linear-gradient(135deg, var(--primary-accent), var(--secondary-accent));
  -webkit-background-clip: text;
  background-clip: text;
}

[data-theme="light"] .section-header h2,
[data-theme="light"] .resources-section h2 {
  background: linear-gradient(135deg, var(--text-primary), var(--primary-accent));
  -webkit-background-clip: text;
  background-clip: text;
}

[data-theme="light"] .module-card {
  background: var(--glass-bg);
  border-color: var(--glass-border);
}

[data-theme="light"] .module-card:hover {
  border-color: rgba(8, 145, 178, 0.3);
  box-shadow:
    0 20px 40px rgba(0, 0, 0, 0.1),
    0 0 60px rgba(8, 145, 178, 0.05);
}

[data-theme="light"] .module-card h3 {
  color: var(--text-primary);
}

[data-theme="light"] .module-icon {
  background: linear-gradient(135deg, rgba(8, 145, 178, 0.15), rgba(124, 58, 237, 0.15));
}

[data-theme="light"] .module-icon svg {
  color: var(--primary-accent);
}

[data-theme="light"] .tag {
  background: rgba(8, 145, 178, 0.1);
  border-color: rgba(8, 145, 178, 0.2);
  color: var(--primary-accent);
}

[data-theme="light"] .youtube-card {
  background: var(--glass-bg);
  border-color: var(--glass-border);
}

[data-theme="light"] .youtube-info h4 {
  color: var(--text-primary);
}

[data-theme="light"] .quick-nav {
  background: rgba(255, 255, 255, 0.95);
  border-top-color: var(--glass-border);
}

[data-theme="light"] .quick-nav-btn {
  background: rgba(0, 0, 0, 0.02);
  border-color: var(--glass-border);
}

[data-theme="light"] .quick-nav-btn:hover {
  background: rgba(8, 145, 178, 0.1);
  border-color: var(--primary-accent);
}

[data-theme="light"] .quick-nav-btn .nav-title {
  color: var(--text-primary);
}

[data-theme="light"] .module-nav {
  background: rgba(255, 255, 255, 0.9);
}

[data-theme="light"] .module-nav a {
  background: rgba(0, 0, 0, 0.03);
  border-color: var(--glass-border);
  color: var(--text-secondary);
}

[data-theme="light"] .module-nav a:hover {
  background: rgba(8, 145, 178, 0.1);
  border-color: var(--primary-accent);
  color: var(--primary-accent);
}

[data-theme="light"] .module-nav .nav-next {
  background: linear-gradient(135deg, var(--primary-accent), var(--secondary-accent));
  color: var(--text-on-accent);
}

[data-theme="light"] header {
  background: rgba(255, 255, 255, 0.9);
}

[data-theme="light"] header h1 {
  color: var(--text-primary);
}

[data-theme="light"] section,
[data-theme="light"] .card {
  background: var(--glass-bg);
  border-color: var(--glass-border);
}

[data-theme="light"] section:hover,
[data-theme="light"] .card:hover {
  border-color: rgba(0, 0, 0, 0.12);
  box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .bilingual-block .zh {
  color: var(--text-primary);
}

[data-theme="light"] .bilingual-block .en {
  color: var(--text-secondary);
  border-left-color: var(--glass-border);
}

[data-theme="light"] details {
  background: rgba(0, 0, 0, 0.03);
}

[data-theme="light"] summary {
  color: var(--text-primary);
  background: rgba(0, 0, 0, 0.02);
}

[data-theme="light"] summary:hover {
  background: rgba(0, 0, 0, 0.05);
}

[data-theme="light"] .feedback-area {
  background: rgba(8, 145, 178, 0.08);
  border-left-color: var(--primary-accent);
  color: var(--text-primary);
}

[data-theme="light"] input,
[data-theme="light"] textarea {
  background: rgba(0, 0, 0, 0.03);
  border-color: var(--glass-border);
  color: var(--text-primary);
}

[data-theme="light"] input:focus,
[data-theme="light"] textarea:focus {
  background: rgba(0, 0, 0, 0.05);
  border-color: var(--primary-accent);
}

[data-theme="light"] input::placeholder,
[data-theme="light"] textarea::placeholder {
  color: var(--text-secondary);
}

[data-theme="light"] .bottom-nav-btn {
  background: var(--glass-bg);
  border-color: var(--glass-border);
}

[data-theme="light"] .bottom-nav-btn:hover {
  border-color: var(--primary-accent);
}

[data-theme="light"] .bottom-nav-btn .nav-module-title {
  color: var(--text-primary);
}

[data-theme="light"] .bottom-nav-btn.next {
  background: linear-gradient(135deg, rgba(8, 145, 178, 0.1), rgba(124, 58, 237, 0.1));
}

[data-theme="light"] .side-nav-btn {
  background: rgba(255, 255, 255, 0.9);
  border-color: var(--glass-border);
  color: var(--text-secondary);
}

[data-theme="light"] .side-nav-btn:hover {
  background: rgba(8, 145, 178, 0.1);
  border-color: var(--primary-accent);
  color: var(--primary-accent);
}

[data-theme="light"] footer {
  border-top-color: var(--glass-border);
}

[data-theme="light"] img {
  border-color: var(--glass-border);
}

/* Light mode specific cards */
[data-theme="light"] .practice-card {
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.08), rgba(8, 145, 178, 0.08));
  border-color: rgba(124, 58, 237, 0.15);
}

[data-theme="light"] .projects-card {
  background: linear-gradient(135deg, rgba(22, 163, 74, 0.08), rgba(13, 148, 136, 0.08));
  border-color: rgba(22, 163, 74, 0.15);
}

[data-theme="light"] .quick-nav-btn.practice {
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.15), rgba(8, 145, 178, 0.15));
  border-color: rgba(124, 58, 237, 0.2);
}

[data-theme="light"] .quick-nav-btn.projects {
  background: linear-gradient(135deg, rgba(22, 163, 74, 0.15), rgba(13, 148, 136, 0.15));
  border-color: rgba(22, 163, 74, 0.2);
}

/* Note boxes in light mode */
[data-theme="light"] .note-box {
  background: rgba(0, 0, 0, 0.02) !important;
}

/* Scroll indicator */
[data-theme="light"] .scroll-arrow {
  border-right-color: var(--primary-accent);
  border-bottom-color: var(--primary-accent);
}

/* Theme toggle hover in light mode */
[data-theme="light"] .theme-toggle:hover {
  background: rgba(8, 145, 178, 0.1);
}

/* Projects page light mode */
[data-theme="light"] .project-pill {
  background: rgba(8, 145, 178, 0.1);
  border-color: rgba(8, 145, 178, 0.3);
  color: var(--primary-accent);
}

[data-theme="light"] .project-badge {
  background: linear-gradient(135deg, var(--primary-accent), var(--secondary-accent));
}

[data-theme="light"] .prereq-box {
  background: rgba(124, 58, 237, 0.08);
  border-color: rgba(124, 58, 237, 0.15);
}

[data-theme="light"] .prereq-item {
  background: rgba(0, 0, 0, 0.03);
}

[data-theme="light"] .prereq-item strong {
  color: var(--text-primary);
}

[data-theme="light"] .step-section {
  background: rgba(0, 0, 0, 0.02);
}

[data-theme="light"] .step-header h3 {
  color: var(--text-primary);
}

[data-theme="light"] .terminal-block {
  background: #1e293b;
  border-color: rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .terminal-header {
  background: rgba(0, 0, 0, 0.2);
}

[data-theme="light"] .test-item {
  background: rgba(0, 0, 0, 0.03);
}

[data-theme="light"] .challenge-box {
  background: linear-gradient(135deg, rgba(251, 191, 36, 0.08), rgba(245, 158, 11, 0.08));
  border-color: rgba(251, 191, 36, 0.2);
}

/* Table styles for light mode */
[data-theme="light"] table {
  color: var(--text-primary);
}

[data-theme="light"] th {
  color: var(--text-primary);
}

[data-theme="light"] td {
  color: var(--text-secondary);
}

[data-theme="light"] td strong {
  color: var(--text-primary);
}